Copy protection method and system for digital media

A copy protection system for digital media, the system comprising:

• a private key verifier receiving a media certificate that includes a private key identification of a compliant playing device and searching for an actual private key corresponding to said private key identification;
• an intermediate key decryptor receiving an encrypted intermediate key and decrypting said intermediate key with said actual private key;
• a media key decryptor obtaining an original media key by decrypting said decrypted intermediate key with a media identification;
• and
• a media data decryptor receiving an encrypted media data set and decrypting said media data set with said original media key, wherein said original media key and said intermediate key are encrypted with independent encipherment algorithms.

A copy protection method for digital media, the method comprising:

• (a) receiving an encrypted media data set, an encrypted intermediate key, and a media certificate from an external source, wherein an original media data set is encrypted with an original media key to create the encrypted media data set, said encrypted intermediate key is generated by encrypting an original media key with a media identification and is encrypted by a public key of the receiving device, and said media certificate includes a private key identification of said receiving device, wherein said original media key and said intermediate key are encrypted with independent encipherment algorithms and wherein said media identification and said public key are separately provided and are independent of each other;
• (b) searching for an actual private key corresponding to said private key identification;
• (c) decrypting said delivered encrypted intermediate key with said actual private key;
• (d) obtaining said original media key by decrypting said decrypted intermediate key with said media identification;
• and
• (e) decrypting said delivered encrypted media data set with said obtained media key.